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ISL21400
Typical Performance Curves
(Continued)
1.209
1.208
1.207
1.206
1.205
1.204
1.203
1.202
1.201
V REF REGISTER = 255d
TS REGISTER = 127d
AT +25°C
1.200
-1
-0.5
0
0.5
1
I OUT (mA)
FIGURE 13. V OUT vs I OUT (±1mA)
Pin Descriptions
V OUT
Programmable voltage output pin. Absolute voltage is
determined by device temperature and Equation 1. Drive
capability is limited to ±500μA output current and 5000pF
output capacitance.
A2, A1, A0
Hardware slave address pins that can be used to provide
several ISL21400 with a unique physical address to allow for
multiple devices off one I 2 C bus.
GND
This is the circuit ground pin. It is common for the V OUT and
control signal inputs.
SDA
Serial Data Input/Output. Bidirectional pin used for serial
data transfer. As an output, it is open drain and may be
wire-ored with any number of open drain or open collector
outputs. A pull-up resistor is required and the value is
Functional Description
Functional Overview
Refer to the Functional Block Diagram on page 2. The
ISL21400 provides a programmable output voltage which
combines both a temperature independent term and a
temperature dependent term. The temperature independent
term uses a bandgap voltage reference, and the
temperature dependent term uses a Proportional To
Absolute Temperature (PTAT) reference, or Temperature
Sensor. Each voltage source is scalable using two DACs via
the I 2 C serial bus. The resulting output voltage can vary from
0V to over 5V and has a variable, programmable
Temperature Slope (TS).
Reference Sections
Referring to the Block Diagram on page 2, the V REF and
Temperature Sense (V TS ) outputs are summed together ( Σ )
and then passed through the output gain stage (A). The
voltage output is programmable and is determined by
Equation 1:
V OUT = A V ? ? V REF ? ---------- + V TS -------------------------------- ?
?
?
dependent on the speed of the serial data bus and the
number of outputs tied together.
SCL
Serial Clock Input. Accepts a clock signal for clocking serial
data into and out of the device. The SCL line requires a
pull-up resistor whose value is dependent on the speed of
the serial clock bus and the number of inputs tied together.
V CC
Positive Power Supply. Connect to a voltage supply in the
range of 2.7V < V CC < 5.5V, with minimum noise and ripple. For
best performance, bypass with a 0.1μF capacitor to ground.
If the A V gain is set to 4 and V OUT approaches 5.0V, then
V CC must be set to >5.2V for best output performance.
? n ( 2 ? m ) – 255 ?
255 255
where:
? A V = 1, 2, 4
? V REF = 1.200 (not temperature dependent)
? 0 ≤ n ≤ 255 (setting contained in Register 0, V REF )
? V TS = K(T - T 0 )
? K = dV TS / dT = -2.1mV/C
? T = device temperature
? T 0 = +25°C
? 0 ≤ m ≤ 255 (setting contained in Register 1, TS)
(EQ. 1)
See “Applications Information” on page 14 for ways to use
Equation 1 and methods for output voltage calculations.
10
FN8091.3
March 31, 2011
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